带有python 3.8的Msys2：ImportError：无法从'io'导入名称'open_code'

Question

几个月前，我已经更新了msys2系统。现在，我第一次要再次使用python，但找不到许多软件包（我想这是由于升级，请参阅下面的原因）。我将在此处描述发现的顺序，为清楚起见，我将在下面发布支持代码。

1. 我可以启动python，但是在python中找不到pandas（例如）和许多其他软件包。/mingw64/lib/python3.7/site-packages本质上是空的（升级到3.8时一定要清空）。

2. 正在寻找pandas软件包，我已经安装了它。

3. [我有python 3.8的pandas，肯定是从3.7升级的。

4. PYTHONPATH从3.7重定向到3.8

5. 现在我什至无法启动python。

我如何修复python3.8，并出现以下错误？

ImportError: cannot import name 'open_code' from 'io' (unknown location)

相关：

https://github.com/tox-dev/tox/issues/1334

https://github.com/yan12125/python3-android/issues/19

https://python-forum.io/Thread-Fatal-Python-error-init-sys-streams-can-t-initialize-sys-standard-streams-Attribute

---

TL; DR：支持代码

1. [pandas找不到

   $ python
   Python 3.7.4 (default, Jul 11 2019, 10:29:54)
   [GCC 9.1.0] on msys
   Type "help", "copyright", "credits" or "license" for more information.
   Reading /home/RY16205/.pythonrc
   readline is in /usr/lib/python3.7/lib-dynload/readline.cpython-37m.dll
   >>> import pandas                                    
   Traceback (most recent call last):                   
     File "<stdin>", line 1, in <module>                
   ModuleNotFoundError: No module named 'pandas'        
   >>>
   

2. [pandas已安装

   $ pacman -Sl | grep python | grep installed
   mingw64 mingw-w64-x86_64-python 3.8.2-1 [installed: 3.8.1-1]
   mingw64 mingw-w64-x86_64-python-apipkg 1.5-1 [installed]
   ...
   mingw64 mingw-w64-x86_64-python-pandas 1.0.3-1 [installed: 1.0.1-1]
   ...
   mingw64 mingw-w64-x86_64-python2-setuptools 44.1.0-1 [installed: 42.0.2-1]
   msys python 3.7.4-1 [installed]
   msys python2 2.7.17-1 [installed]
   

3. [我有python 3.8的pandas

   $ pacman -Ql mingw-w64-x86_64-python-pandas | head -5
   mingw-w64-x86_64-python-pandas /mingw64/
   mingw-w64-x86_64-python-pandas /mingw64/lib/
   mingw-w64-x86_64-python-pandas /mingw64/lib/python3.8/
   mingw-w64-x86_64-python-pandas /mingw64/lib/python3.8/site-packages/
   mingw-w64-x86_64-python-pandas /mingw64/lib/python3.8/site-packages/pandas-1.0.1-py3.8.egg-info/
   

4. PYTHONPATH从3.7重定向到3.8

   已更改

   export PYVERSION="3.7"
   export PYTHONDIR2="${MINGW_HOME}/lib/python${PYVERSION}"
   export PYTHONPATH="${PYTHONDIR2}:${PYTHONDIR2}/site-packages"
   

   to

   export PYVERSION="3.8"
   ...
   

5. 甚至都无法启动python。

   $ python
   Fatal Python error: init_sys_streams: can't initialize sys standard streams
   Traceback (most recent call last):
     File "/c/Users/ry16205/Documents/appls_mydocs/PortableApps/MSYS2Portable/App/msys32/mingw64/lib/python3.8/io.py", line 54, in <module>
   ImportError: cannot import name 'open_code' from 'io' (unknown location)
   Aborted (core dumped)
   

Answer 1

我有完全相同的问题。

我建立python 2.7，更改PATH变量，但仍然失败